1. Principle of individual treatment: Since different patients have different physiques, conditions, psychological qualities, subjective functional requirements, and surgical procedures, there are no uniform rules for post-operative rehabilitation of artificial knee replacements, which should vary from person to person. 2, the principle of comprehensive training: the knee is only one of the walking weight-bearing joints, such as rheumatoid arthritis often involves multiple joints, multiple organs, therefore, simply dealing with the knee is not enough to improve the patient’s function, artificial knee arthroplasty rehabilitation must take into account other parts of the body. 3, the principle of gradual progress: patients who receive knee replacement have longer-term pain, deformity and dysfunction, and the soft tissues, muscles and bones around the knee are invaded, so the patient’s level of function can only be gradually improved, do not be too hasty, so that undue damage occurs.